Hello,
I would like to build a brushless servo motor that is as small as possible, maybe with gears and high precision. I found this T-Motor GB2208-V2 (https://store.tmotor.com/goods-447-GB2208.html) gimbal motor and thought it wouldn't be that bad because it's small, has enough torque and a small kv number. Is this a good idea?
If yes:
I want to control the motor like a servo with signal, VCC and ground, in a closed loop. For that I need an ESC and an encoder. I've read that you can't control such gimbal motors with an ordinary ESC and you only need a few amps. Does anyone have any recommendations or a good place to look?
You need to be a bit more specific about what your project is about .
Do you really mean build a servo or something else . That motor is not especially small and you can buy servos smaller than that .
If you just want to have a brushless motor drive some device continually , then it’s a different issue . Check what you really mean /want to do
Have a read of forum guidelines and get back to us .
I need a small motor with precise control over the angular position of the shaft and about 1 to 5 Nm of torque. The motor must be able to rotate at least 360 degrees. Since I am not aware of any off the shelf servo motors that meet these requirements, I looked around and found robotic actuators that consist of brushless motors (OpenQDD Actuator — Aaed Musa). There are already projects where such servos have been built for robots (B-G431B-ESC Brushless Servo Controller | Hackaday.io) because I don't have that much space and not that much power need this gimbal motor(https://store.tmotor.com/goods-447-GB2208.html). However, this type of brushless motor cannot be controlled with a normal ESC (there are extra gimbal controllers, which in turn do not meet my requirements because in this case something should not be kept stable in two or three axes, but individual motors should be controlled). So I need an ESC that can cope with the small kv numbers of the gimbal motor and has a low output power of a few amperes. Further more it should support the use of an encoder. I wasn't able to find such an ESC and just wanted to ask if I'm wrong somewhere or if anyone has more insight and could recommend something.
The motor you selected is only 0.059 Nm
Sorry my error with the unit
So did you mean 1-5 kg-cm?
"I need a small motor with precise control over the angular position of the shaft and about 1 to 5 Nm of torque"
Sounds like a job for a stepper motor, adding perhaps a 3d printed reduction gearbox to increase torque if necssary, and an encoder if you want to be able to monitor position so as to detect any missed step position drift. "Small" is perhaps slightly problematic here, steppers for that sort of torque can be relatively heavy (though not too big in volume), but a lighter weight stepper with 3d printed reduction gearing (planetary works well) can overcome this.
Hi,
Can you please tell us the actual application, what does the servo operate?
Can you please tell us your electronics, programming, arduino, hardware experience?
Thanks.. Tom... 
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